40 CFR 420.122 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).

§ 420.122Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).

Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

(a)Galvanizing, terne coating, and other coatings—

(1)Strip, sheet, and miscellaneous products.

Subpart L

Pollutant or pollutant property

BPT effluent limitations

Maximum for any 1 day

Average of daily values for 30 consecutive days

1 The limitations for hexavalent chromium shall apply only to galvanizing operations which discharge wastewaters from the chromate rinse step.

2 Within the range of 6.0 to 9.0.

Kg/kkg (pounds per 1,000 lb) of product

TSS

0.175

0.0751

O&G

0.0751

0.0250

Lead

0.00113

0.000376

Zinc

0.00150

0.000500

Chromium (hexavalent) 1

0.000150

0.0000501

pH

(2)

(2)

(2) [Reserved]

(b)Galvanizing and other coatings—

(1)Wire products and fasteners.

Subpart L

Pollutant or pollutant property

BPT effluent limitations

Maximum for any 1 day

Average of daily values for 30 consecutive days

1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.

2 Within the range of 6.0 to 9.0.

Kg/kkg (pounds per 1,000 lb) of product

TSS

0.701

0.300

O&G

0.300

0.100

Lead

0.00451

0.00150

Zinc

0.00601

0.00200

Chromium (hexavalent) 1

0.000600

0.000200

pH

(2)

(2)

(2) [Reserved]

(c)Fume scrubbers.

Subpart L

Pollutant or pollutant property

BPT effluent limitations

Maximum for any 1 day

Average of daily values for 30 consecutive days

1 The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step.

2 Within the range of 6.0 to 9.0.

Kg per day

TSS

38.1

16.3

O&G

16.3

5.45

Lead

0.245

0.0819

Zinc

0.327

0.109

Chromium (hexavalent) 1

0.0327

0.0109

pH

(2)

(2)

The above limitations shall be applicable to each fume scrubber associated with any of the coating operations specified above.